如何解决Maven exec插件:类路径太长错误? [英] How to resolve Maven exec plugin: classpath too long error?

问题描述

我有一个带有大量jar文件依赖项的大型Java项目.当我尝试从Eclipse或Netbeans运行项目(使用exec)时，Maven引发了一个异常，该异常导致类路径上的条目过多(仅包含所需条目的2/3).有谁知道解决方法? (除了构建可执行的jar并从终端运行它.)是否可以扩展""classpath-buffer"大小?

I have a large Java project with a large number of jar file dependencies. When I try to run the project (using exec) from Eclipse or Netbeans, Maven throws an exception which turns out to be a too large number of entries on the classpath (only 2/3 of the needed entries are included). Does anyone know a workaround for this? (Except from building an executable jar and running it from terminal.) Is it possbile to "extend" the "classpath-buffer"-size?

推荐答案

这是一个Maven exec插件错误，已记录在 MEXEC-68 ，记者创建了一个补丁，希望尽快解决.

This is a Maven exec plugin bug, it is documented in MEXEC-68, the reporter created a patch so I hope it will be resolved soon.

一种解决方法是使用maven-jar-plugin的此配置将类路径添加到清单文件，将依赖项添加到文件夹，然后仅将该文件夹添加到CLASSPATH envvar.

One workaround would be to add the classpath to the manifest file using this config for the maven-jar-plugin, add the dependencies to a folder and add just that folder to the CLASSPATH envvar.

例如:

<project>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        ...
        <configuration>
          <archive>
            <manifest>
              <addClasspath>true</addClasspath>
            </manifest>
          </archive>
        </configuration>
        ...
      </plugin>
    </plugins>
  </build>
  ...
</project>

这会将类似清单的内容添加到清单中

This will add to the manifest something like:

Class-Path: plexus-utils-1.1.jar commons-lang-2.1.jar

如果该JAR位于CLASSPATH文件夹中，则可以使用maven exec插件运行该JAR，将其隐藏在类路径中，例如:

If that JARs are in a CLASSPATH folder, you can run your JAR using maven exec plugin hidding the classpath with something like:

mvn exec:exec [...] -Dexec.classpathScope="test"

我使用-Dexec.classpathScope ="test"来使插件忽略依赖项，而仅在范围测试中添加依赖项.

I used -Dexec.classpathScope="test" to make the plugin ignore the dependencies and add just the ones in scope test.

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